Automatic stop mechanism for sound-reproducing machines.



E. KRAMM, II.

AUTOMATIC STOP' I VIECHANISM F01? SOUND RE PRODUCING MACHINES.

' APPLICATION FILED AUG.27, l914.

1,172,37. I Patented F61; 22, 1916.

' 2 SHEETS-SHEET I.

I ;E. KRAMM, JR. AUTOMATIC STOP MECHANISM FOR SOUND REPRODUCING MACHINES. APPLICATION FILED AUGJZT. 19M.

Patented Feb. 22,1916

2SHEETS-SHEET 2- ERHARD KRAMM, JR., 0F PEORIA, ILLINOIS.

AUTOMATIC STOP MECHANISM FOR SOUND-REPRODUCING MACHINES.

Specification of Letters Patent.

Patented Feb. 22, 11916.

Application filed August 27, 1914. Serial No. 858,790.

To all whom it may concern:

'Be it known that I, ERHARD KRAMM, Jr., a citizen of the United States, a resident of Peoria, in the county of Peoria and State of Illinois, have invented new and useful Improvements in Automatic Stop Mechanism for Sound-Reproducing Machines, of which the following is a specification.

My invention relates to improvements in automatic stop mechanism for sound reproducing machines and is particularly adapted to the machines of the type using a disk or fiat circular record.

The principal object of this invention is the provision of means for automatically stopping the rotation of the revoluble turntable and disk thereon upon the completion of the reproduction of the record, that is ofthe travel of the stylus-point in the record grooves.

A further object of my invention is the provision of a member adapted to engage and brake the rotatable table, said member being actuated at the completion of the reproduction of the record by the swingable portion of the tone-arm or horn, suitable operative connections being provided therebetween.

Another object of my invention is the provision of a member adapted to engage and brake the rotatable table, said member being normally held in non-engaging position while the record is being reproduce by means adapted to be released when the stylus-point of the reproducer has completed its travel through the record groove, the release of said braking member being accomplished through connections from said tone-arm or horn.

Another object of my invention is the provision-of a device of the character described which may be made and sold in the form of an attachment to be applied to existing forms of sound reproducing machines without the necessity of reconstructing the same or making material changes.

To the accomplishment of the foregoing and such other objects asmay hereinafter appear, my igivention consists in the construction, combination and arrangement of parts hereinafter described and then sought to be defined in the appended claims, reference being made to the accompanying drawings forming a part hereof and which show merely for the purpose of illustrative disclosure, a preferred embodiment of my 1ntice within the scope of the claims without I digressing from my inventive idea.

In the drawings, Figure 1 represents a plan view of a portion of a standard form of sound reproducing machine with a device constructed according to my invention applied thereto, parts being broken away to facilitate disclosure, the device being shown in the position assumed when braking, that is after the reproduction of the record is completed. Fig. 2 represents a plan View on a larger scale of the operating parts of my invention, shown in the position assumed when braking, as shown in Fig. -1. Fig. 3 is a- View similar to Fig. 2, the parts, however, being shown in a non-engaging or non braking position. Fig. 4 represents a detail sectional view taken substantially on line 44 of Fig. 3. Fig. 5 is a vertical sectional view through the swivel portion of the tonearm or horn showing the spring for normally forcing the tone-arm or horn inwardly toward the center of the disk. Fig. 6 is a plan view of a modification of a detail of the manner of mounting and securing the spring.

In the operation of the sound reproducing machines it is frequently inconvenient to manually stop the machine at the completion of the reproduction of the record.

If the machine is permitted to run, considerable disagreeable sound results from the scratching of the stylus-point on the ungrooved portion of the disk. This may also result in injury to the reproducer and to defacement of the disk. In view 01 these conditions a machine is left idle frequently, whereas were some automatic means provided for the stopping of the rotation of the table and disk upon the completion of the reproduction, the machine could be used considerably more without the liability of damage and the production of noise. It is, therefore, the purpose of my invention to provide a device, preferably in the form of an attachment, which is operated by the tone-arm or horn at the completion of the reproduction of the record to automatically brake the rotatabletable to stop the rotation of the same and the record, this device being capable of being reset readily so that the machine can be easily started.

Referring now to the drawings and partlcularly to Fig. 1, the numeral 1 designates the swingable tone-arm or horn, which is swlveled so as to travel in the spiral sound groove of the record. 2 designates the table or disk support which is rotated by some suitable motor and is adapted to support and hold the record disk thereon. I also show reproducer '3 and the stylus-point 4. These parts are all well known forming part of a standard type of sound reproducing machine, the complete illustration of which is not made as it does not form part of my invention and iswell understood in the art. Mounted on the casing 5 is the supporting plate or member 6 onwhich the various operating parts of the device are located and supported,

as will be described. The disk 7 is mounted on said plate 6 so as to rotate or-oscillate thereon and has the extension or arm 8 projecting outwardly therefrom and along the tone-arm or horn, as shown. This extension or arm 8 is adapted to be engaged by the tone-arm or horn 1 when the stylus on the reproducer reaches the terminus of the sound groove in the record, the set screw 9 being provided in the end thereof whereby any suitable adjustment may be made as necessary. This disk 7 has the cam-shaped cut-out portion 10 on one side with the lug.

or projection 11 at the inner end thereof. Located adjacent the disk 7 on the plate 6 is the braking and setting disk12, this disk being also adapted to rotate or oscillate on said plate 6 and having the ecess or socket 13 corresponding in size anl shape to the lug or projection 11 on the disk 7. This lug or projer ion 11 and the recess or socket 13 cooperate to lock the braking disk in a nonbraking or set position to permit the table to rotate. Projecting from said disk 12 is the brake arm or member 14 which is bent as at 15 to extend tangentially to said disk 12, as shown, the frictional braking member or plug 16 being mounted in the end thereof and adapted to engage a part of the table to stop its rotation. The setting arm or member 12 also extends outwardly from said disk 12 to a position for convenient manipulation by the operator.

As stated licreinbefore each of the disks 7 and 12 are mounted on the plate member 6 so as to rotate or oscillate. This mounting is shown in detail in Fig. 4. Each disk is pivoted on a pin or rivet 17 which has the head'lS, a frusto-conical portion 19 inclining downwardly therefrom, an enlarged flange-like portion 20 on which the disk fits loosely, and a reduced extremital portion 21 for securing in the plate member 6.

. The inclined portion 19 of the rivet or pin 17 is for the purpose of forcing the spring member 22 downwardly on the disk and holding it there so' as to prevent the displacement of the parts. This spring member bearsagainst the lug or. rivet 23 at the other end of the plate member 6, against the pin or rivet 17 as above described, and

against the lug or rivet 24 on the outer portion of the disk. This construction is-the same for the two disks and they are therefore normally forced in a clock-wise direction, as is evident from. a consideration of for forcing the disk in a clockwise direction. This spring 30 is looped around .the lug or rivet 24, as at 31, and the free end 32 passes on the other side of the pin or rivet 17.

This holds the -parts in position better againstaccidental displacement.

The operation of the device is as follows, it being'assumed that the set screw 9 is properly adjusted and the record disk on the table: The parts are in the position shown in Fig. 2. The setting arm 12 is moved downwardly, that is referring to the drawing, it being understood that in practice this movement is horizontal. This rotates the disk 12 on its pin or rivet '17 counter clockwise causing the lug'or projection 11 on the disk 7 to engage the recess or socket 13 in the disk 12, which therefore locks the braking arm 14 in a non-braking position, as shown in Fig. 3. \rVhen the stylus has completed its path of travel in the sound groove in the record, the spring 25 will force the tone-arm or horn rather suddenly toward the center of the disk, as there is no sound groove to interpose resist ance to this movement, which through the engagement of the tone-arm or horn with the extension or arm 8 of the disk 7 results in a. partial rotation of the disk 7 causing the lug or projection 11 to withdraw from the recess or socket 18. the spring member 22 on the disk 12 causin its partial rotation to assist said disengagement and to force the brake arm or me her l-t against'the periphery of the talne. This brakes the table and prevents it from rotating so that the disk can be removed at any time that is convenient. It is to be noted that by having the brake arm constructed asshown, it jams against the periphery of the table and that any further rotation of the table increases the force of the r ngagement of the brake therewith due to the position of the pivot or fulcrum of th'e brake arm. It is of course understood, that the tone-arm or horn is moved so that the stylus-point is positioned at the beginning of the record groove before the setting arm or member 12 is actuated to cause the disks to assume the positions shown in Fig. 3 of the drawings, this movement being necessary first on account of the engagement of the member 8 with the tone-arm or born when the machine is stopped.

I have described the plate member 6 as being mounted on the casing, but it is to be understood that this plate may be mounted at any place and the disks mounted in any manner just so that they cooperate'properly to produce the action above set forth. Further, the detailed construction of the resilient means and the manner of mounting the same as well as that of the other parts is merely illustrative, being one of many forms that may be used as desired and according to various conditions. I have shown the brake as engaging the inside periphery of the table, but this engagement may be made in various other manners and places, as is obvious.

What I claim is 1. An automatic stop mechanism for sound reproducing machines, including a turn table, a swinging arm, a member mounted to oscillate and having an arm or extension adapted to be located in the path of movementof the swinging arm, so that said oscillatory member may be actuated thereby, and a second member mounted to oscillate and having a brake arm or member with means for normally tending to force the same. into engagement with the turn table to stop the rotation of the same, said first mentioned oscillatory member having a cam shaped cutout portion with a lug or projection at one end thereof, said second mentioned oscillatory member adapted to fit in said cut-out portion and having a recess or socket with which said lug or projection is adapted to engage whereby the brake arm or member is normally held in non-braking position, the engagement of the swinging arm with the arm or extension of the first mentioned oscillatory member being adapted to release said second mentioned oscillatory member from its locked condition, so that the brake arm or member may be forced ggainst the turn table.

2. An automatic stop mechanismfor sound reproducing machines including a tu n table, a swinging arm, a pair of members mounted to oscillate, one of said oscillatory members having an arm or extension adapted to be positioned in the path of movement of the swinging arm, the other of said oscillatory members having a brake arm or member adapted to engage the turn table, cooperating parts on said oscillatory members whereby the brake arm or member may be held in a non-braking position,- the oscillating mounting of each member includ ing a pin having a head and an enlarged flange like portion on which the member fits loosely with a frusto-conical portion inclining downwardly located therebetween, alug on each member and a spring for each member having one end held against movement .and fitting against the frusto-conical portion of each pin with its other end engaging said lug on each member on the side opposite the side of the pin engaged, whereby the first mentioned oscillatory member is normally forced so that the arm or extension is moved toward the swinging arm and so that the second mentioned oscillatory member is normally moved toward a braking position.

3. An automatic stop mechanism for sound reproducing machines, including a turn table, a swinging arm, a support, a pair of disks rotatably mounted on said support, one of said disks having a braking arm or extension and the other of said disks having an arm or extension adapted to be positioned in the path of movement of the swinging arm, said disks having coiiperating locking parts whereby the brake arm or extension may be held in non-braking position, said rotatable mounting of the disks including a member extending above the surface of the disks, lugs on said support and a lug on each disk, and resilient means one for each disk engaging said lugs and said rotatable mounting member, whereby the disks are normally held in a braking position.

4. An attachment for sound reproducing machines, including a support, a pair of disks mounted to oscillate thereon, each of said disks having an arm or extension, one of said arms or extensions being provided with braking means, the oscillating mounting of said disks including a member extending above the surface of the disks, lugs on said support and lugs on said disks on the side opposite said lugs on said support, and resilient means one for each disk engaging one of said lugs on said support, and one of said lugs on said disks, and also engaging said oscillatory mounting on the side opposite to which it engages said lugs, whereby the disks are normally held in a braking position, said disks having cooperating parts whereby they may be locked in a non-braking position.

5. An automatic stop mechanism for sound reproducing machines, including a turn table, a swinging arm, a member mou nted to oscillate and having an arm or extension adapted to be located in the path of movement of the swinging arm, so. that said oscillatory member may be actuated there i by, and a second member mounted'to-oscillate and having a brake arm or, member with means for normally tendirfg to force the same into engagement with the'turn table tostop the rotation of the same, said first mentioned oscillatory member having a cam shaped cutout portion with a lug or oscillatory member having a setting arm extending outwardly therefrom and providing 15 1 means for oscillating said second mentioned oscillatory member so as to bring the lug or projection on the first mentioned oscillatory member into engagement with the recess 0r socket of the second mentioned oscillatory 20 member to hold the brake in a non-braking I position.

ERHARD KRAMM, JR. W'itnesses GEORGE T. BEAN, J. M. ANDERSON. 

